Plastic fire brick



Patented Nov. 17,1925. 1,561,571-

UNITED STATES PATENT OFFICE.

WILLIAM A. L. SCHAEFER,,OF CHICAGO, ILLINOIS, ASSIGNOR TO PLIBRICO JOIN TLESS FIBEBRICK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PLASTIC FIRE BRICK.

mnmwin Application filed April 9, 1919. Serial No. 288,745.

To all whom it may concern: with sodium and potassium oxides only in 6 Be it known that I, WILLIAM A. L. trace.

SGHAEFER, a citizen of the United States, Of clay of this type I employ two porresiding at Chicago, in the county of Cook tions, in the proportion of approximately and State of Illinois, have invented a cernine parts and two parts, and the smaller tain new and useful Improvement in Plastic portion of which is calcined. I thereupon 60 Fire Brick, of which the following is a full, mix these two portions and then add to clear, concise, and exact description. them, considering them as eleven parts, ap-

My invention relates to plastic fire brick proximately eighteen parts of ordinary 10 and method of making same and contemburned (such as used) fire brick ground plates a new plastic fire brick, as a composiand passed through a quarter inch mesh 65 tionof matter, and a new process by means screen. This entire mas is then mixed of which this new composition of matter is thoroughly dry, preferably by the use of prepared. 7 suitable agitators, and, later, in the course As is Well known in the art, So called plasof which mixing sufficient water to effect a tie fire brick is used for the building of stifi plastic condition is added. The mate- 7 I one piece furnace linings, arches and bridge rial is then ready for storage for use, and walls set in largely the same manner that when used is brought back to its original concrete structures are set, and the objects plastic condition by the addition of water of my invention are: if it has become too dry.

(a) To provide an eificient, plastic fire Where I employ the terms rich in alumina 75 brick of abundantly available materials; and low in iron, I intend that the quantita- (b) To provide an efiicient lastic fire tive values represented by these terms be brick which will not deteriorate between its 'enerally as set out in the analysis hereinoriginal preparation and its use; efore given.

(0) To provide an eflicient, plastic fire The plastic fire brick, thus compounded brick which can readily be prepared for and processed, fuses at approximately three installing. thousand degrees Fahrenheit, and is other- (d) To rovide an eflicient, plastic fire wise of the characteristics set forth as de- 30 brick which will hold together in large sira-ble ones at the outset of this specificamasses and which will be durable when intion. V 85 sta led and baked; I claim:

(e) To provide a plastic fire brick of suit- 1. A. plastic lire-brick comprising a clay ably hi h fusing point; and rich in alumina apportioned into raw and (f) 0 provide a'process wherebly this fire calcined parts in the proportion of nine and rick can be produced economical y. two mixed together and with ground burned 90 To the ends above noted, I have. by exfirc-brick in the proportion of eleven and tended experimentation, determined a cereighteen. tain compositign' of matter, which I have 2. A plastic fire-brick comprising a clay 40 proven out by test and actual use, and which of the following characteristics: Silica,

' I shall set forth and claim hereinafter. from to 62 percent; alumina, from 30 to With reference first to the clay which I per cent; iron and titanium oxide, from employ, assuming silica, of course, to bethe to 3 per cent; lime, from .1 to 1.5per main ingredient, I select a clay as high as cent; alkalies, from .1 to 1.5 per cent; magpossible in aluminaand as low as possible nesia, from .05 to .35 per cent; with sodium 1n sodium oxide, otassium oxide, lime, and potassium oxides only in trace, a-ppormagnesia, iron oxi e and titanium oxide. tioned into raw and calcined parts in the To this end I employ a clay, abundant in proportion of nine and two and mixed toquantity available, as follows: gether and with ground burned fire-brick in Silica, from 50 to 62 per cent; alumina, the proportion of eleven and eighteen. from 30 to 40 per cent; iron and titanium In witness whereof, I hereunto subscribe oxide, from 1.5 to 3 r cent; lime, from .1 my name, this 24th day of March, 1919.

to 1.5 per cent; alka ice, from .1 to 1.5 per cent; magnesia, from .05 to .35 per cent; WILLIAM A. L. SCHAEFEB. 

